Transformer.



Patented Nov. l8, I902.

A. CHURCHWARD.

TBANSFORIER.

(Application filed luv. 13, 1899. Innund Doc. 9, 1901.)

(lo Iollel.)

AEX-A WARE.-

UNITED STATES PATENT OFFICE.

ALEXANDER CHURCHWARD, OF CHICAGO, ILLINOIS, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEWT YORK.

TRANSFORMER.

SPECIFICATION formingpart of Letters Patent N 0. 713,605, dated November 18, 1902. Application filed November 13,1899. Renewed December 9, 1901, Serial No. 85,151. (No model.)

To all whom it may concern-s maybe secured closely together by very sim- Be it known that I, ALEXANDER CHUROH- ple fastening means, the coils being secured WARD, a citizen of the United States, residing in place by simple wedges interposed between at Chicago, in the county of Cook and State the curved ends thereof and the central rib 55 of Illinois, have invented a certain new and or core portion of the transformer-core.

useful Improvement in Transformers, (Case I will explain my invention more particu- No. 295,) of which the following is a full, clear, larly by reference to the accompanying drawconcise, and exact description, reference beings, in whiching had to the accompanying drawings, form- Figure l is a view showing U and T core- 60 IO ing a part of this specification. plates. Fig. 2 isasectional view showing the My invention relates to transformers for transformer-coils in place about the central employmentin the distribution of alternating rib of the shell-core. Fig. 3 is a plan view of electric current, and has for its object the acomplete transformerconstructedin accordimprovement in the construction of the shell ance with my invention; and Fig. 4 is an end 65 I5 type of transformers where the primary and elevation of the transformer-coils, core-plates secondary coils are completely inclosed by being shown slightly removed from each side the core of the transformer, the coils being of the coils to illustrate the manner in which disposed aboutacentral core-rib, which forms they are assembled.

a common side of two rectangular core por- Like parts are indicated by similar letters t1ons. of reference throughout the different figures. The object of my invention is so to con- The core-plates a are of U shape, the outer struct the laminae of which the core is made corners of the base portions being preferably up that the core may readily be built about rounded, as are also the outer corners of the formed transformer-coils, while at the same free ends of the legs of the said plates. The 75 time the magnetic resistance in the core is plates 5 are stamped in the form of the letter reduced to a minimum. T, the stems of the T-plates being preferably It is the further object of my invention to twice as wideas the portions of the core-plates provide a shell type of transformer which a and Z) making up the shell that incloses the shall be very compact and whereby great transformer-coils. As has been said, the U 80 efficiency may be secured with a transformer and T plates are assembled together, one plate of small size for a given capacity. a and one plate I) completing a lamina of the In its preferred embodiment my invention transformer-core. The stems of the T-platcs consists in a transformer of the shell type, are preferably of such length that when they having its core composed of laminae made are brought into contact with the basesof the 85 up of U-shaped and T-shaped portions and U-plates the heads of the T-plates form with formed transformer-coils, the U-shaped corethe legs and bases of the U-plates a complete plates being assembled alternately from oprectangle, the heads of the T-plates being disposite sides of the coils, as are also the T- posed between the free ends of the legs of the shaped plates, the arrangement of the plates U-plates. 9o being such that the U-shaped plates lie in I have shown two sets of coils, each set cone the same planes with the T-shaped plates, so prising a primary winding 0 and a secondary that gaps between the laminae are avoided, winding (1. Each set of coils is preferably while by the insertion of the plates, as speoiseparately formed and inolosed in a suitable fied, alternately from opposite sides of the insulatirig-wrapper. In the instance shown coils the gaps between the U and T plates the two sets of coils are assembled. side by are closed to reduce and practically eliminate side. In building a transformer in. accordthe resistance in the magnetic circuit that ance with my invention the coils are first aswould otherwise be due to these gaps. sembled in alinement. A U-plate may then A shell type of transformer constructed in have its base engaged with one side of the 10c accordance withmyinventionis ofverysimple coils and the head of a T-plate with the opconstruction, as the laminae when assembled posite side of the coils, the stem of the T-pla'.e

engaging the base of the U-plate, while the head of the T-plate engages the coils and is disposed between the legs of the U-plate, the U and T plates being thus assembled in a single plane. The next U-plate is then preferably placed in position to have its base engaged with the same side of the coils that is engaged by the said T-plate. The stem of a second T-plate is then inserted through the coils from the opposite side, the head of this T-plate engaging the side of the coils engaged by the base of the first aforesaid U-plate. Thus the plates are assembled alternately on opposite sides of the coils. The gaps that exist between the head of each T-plate and the legs'of the alined U-plate are closed by the base portions of adjacent U-plates.

After the core-plates have been assembled in position the coils and core may be firmly united by means of wedges e and f, interposed between the rounded ends of the coils and the central core portion formed of the stems of the T-plates.

I do not wish to be limited to the precise construction shown; but,

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. In a transformer, the combination with the transformer-coils, of a shell-core therefor comprising U and T shaped plates, the T- plates being inserted through the coils alternately from opposite sides thereof and engaging the base portions of the U-plates placed about the coils from opposite sides thereof, and fastening means for securely uniting the transformer coils and core, the head portions of the T-plates being disposed between the legs of the U -plates, substantially as described.

2. In atransformer, the combination with the transformer-coils, of a shell-core therefor comprising U and T shaped plates, the T- plates being inserted through the coils alternately from opposite sides thereof and engaging the base portions of the U-plates placed about the coils from opposite sides thereof, and fastening means for securely uniting the transformer coils and core, substantially as described.

3. In a transformer, the combination with transformer-coils, of a shell-core therefor comprising U and T shaped plates, the stems of the T- lates being inserted through the coils and engaging the base portions of the U- 55 plates, the head portions of the T-plates and the base and leg portions of the U-plates forming a shell which incloses the transformercoils, and fastening means for firmly uniting the transformer coils and core, substantially as described.

4. In a transformer, the combination with primary and secondary coils, of a shell-core therefor comprising U and T shaped plates, the stems of the T- plates being inserted through the coils, the heads of the T-plates with the base and leg portions of the U-plates serving to inclose the coils, and clamping means for firmly uniting the coils with the core, substantially as described.

In witness whereof I hereunto subscribe my name this 10th day of November, A. D. 1899. ALEXANDER OHURCHWARD.

Witnesses:

CHARLES A. BROWN, CHARLES E. HUBERT. 

